Attachment files names changes during send!

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I have to send a bunch of Excel files (typically around 10) to a
supplier every week. They are sequentially numbered (purchase orders)
and the order number is part of the file name.

I attach them and everything looks fine. Then I send them and look in
the sent box and one or two of the files will have renamed themselves
using the names of other files! So if they were numbered 1 to 10,
they would have changed to 1, 2, 3, 3, 5, 6, 7,7, 9, 10 for example.

If you open the attachments, they're fine - despite the name change,
the contents are correct.

My supplier has got used to it now, but I'm baffled. Is there any
obvious explanation?

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange

Check your secure temp folder - how many copies of these files does it contain? (Delete all files in it.)

To view the securetemp folder, at Start menu, Run, type


and expand the Temporary Internet Folders branch to show the OLK* folder(s) in the Folder list (left side of screen).

See for more information.



Thanks - I looked in the secure temp folder and there are no copies of the files in there.

I also checked the OLK folder - as I understand it, that's for incoming files and there weren't any of the files at issue in there either.

These files would be brand-new each time they're sent as the file name is basically a purchase order number so they're never duplicated.

In case it makes any difference I'm not on an exchange server - just sending emails direct from home to using POP.

Somasundaram Pandiaraj

Try creating a new profile and then check if you"re still facing the same issue. Click on the link below for information on how to create a new profile in Outlook.

Note: Ensure to create the email account once you have created the profile.
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